Description
libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a stack-based buffer overflow. The function xmlSnprintfElementContent in valid.c is supposed to recursively dump the element content definition into a char buffer 'buf' of size 'size'. At the end of the routine, the function may strcat two more characters without checking whether the current strlen(buf) + 2 < size. This vulnerability causes programs that use libxml2, such as PHP, to crash.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libxml2 | 2.9.4+dfsg1-3.1 | — |
| Debian 13 | libxml2 | 2.9.4+dfsg1-3.1 | — |
| Debian 12 | libxml2 | 2.9.4+dfsg1-3.1 | — |
| Debian 9 | libxml2 | 2.9.4+dfsg1-2.2+deb9u1 | DSA-3952-1 |
| Debian 8 | libxml2 | 2.9.1+dfsg1-5+deb8u5 | DSA-3952-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | libxml2 | 2.8.0+dfsg1-7+wheezy8 | DLA-1008-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | libxml2 | 2.9.3+dfsg1-1ubuntu0.3 | USN-3424-1 |
| Ubuntu 14.04 LTS | libxml2 | 2.9.1+dfsg1-3ubuntu4.10 | USN-3424-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | libxml2 +1 | 2.9.4-36.1 | SUSE-SU-2017:1538-1, SUSE-SU-2017:1454-1 |
| SLES 12 SP1 | libxml2 +1 | 2.9.1-26.15.1 | SUSE-SU-2017:1587-1 |
| SLES 12 | libxml2 +1 | 2.9.1-26.15.1 | SUSE-SU-2017:1587-1 |
| SLES 11 SP4 | libxml2 | 2.7.6-0.69.1 | SUSE-SU-2017:1557-1 |
| SLES 11 SP4 | libxml2-python | 2.7.6-0.69.3 | SUSE-SU-2017:1557-1 |
| SLES 11 SP3 | libxml2 | 2.7.6-0.69.1 | SUSE-SU-2017:1557-1 |
| SLES 11 SP3 | libxml2-python | 2.7.6-0.69.3 | SUSE-SU-2017:1557-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP2 | libxml2 +1 | 2.9.4-36.1 | SUSE-SU-2017:1538-1, SUSE-SU-2017:1454-1 |
| SLES for SAP 12 SP1 | libxml2 +1 | 2.9.1-26.15.1 | SUSE-SU-2017:1587-1 |
| SLES for SAP 12 | libxml2 +1 | 2.9.1-26.15.1 | SUSE-SU-2017:1587-1 |
| SLES for SAP 11 SP4 | libxml2 | 2.7.6-0.69.1 | SUSE-SU-2017:1557-1 |
| SLES for SAP 11 SP4 | libxml2-python | 2.7.6-0.69.3 | SUSE-SU-2017:1557-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | libxml2 | 2.7.6-0.69.1 | SUSE-SU-2017:1557-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | libxml2-python | 2.7.6-0.69.3 | SUSE-SU-2017:1557-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | libxml2 | 2.9.12-1.2 | openSUSE-SU-2024:11016-1 |
Advisories 12
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- USN-3424-1 libxml2 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3952-1 libxml2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1008-1 libxml2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:1538-1 Security update for libxml2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1587-1 Security update for libxml2 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11016-1 libxml2-2-2.9.12-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1454-1 Security update for libxml2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1557-1 Security update for libxml2 SUSE / openSUSE Security Updates · Feb 4, 2026
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- WID-SEC-2025-0426 libxml2: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Jul 6, 2025
- WID-SEC-2023-1614 Tenable Security Nessus Network Monitor: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 25, 2023
References
- DSA-3952 vendor-advisory
- GLSA-201711-01 vendor-advisory
- http://www.openwall.com/lists/oss-security/2017/05/15/1
- 98556 vdb-entry
- [bookkeeper-issues] 20210628 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 mailing-list
- [bookkeeper-issues] 20210629 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 mailing-list